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f <br /> ANA LYT I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Report Issue Date : 03/30/99 <br /> 10624 Olive Avenue <br /> Oakdale, CA 95361 <br /> Sample Date 02/11/99 <br /> Submission Number 9902000483 Sample Time 10:22 <br /> Lab Number 98876 Sample Type LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-10 <br /> BSK LABORATORIES LUFT ANALYSIS <br /> Date Date <br /> Method Analyte Prep. Anal. Result Units PQL Dil DLR <br /> EPA 8015 / Benzene 02/23/99 02/23/99 ND jug/L 0.3 1 0.3`1 <br /> EPA 8020 i <br /> (MODIFIED) <br /> EPA 8015 / Ethylbenzene 02/23/99 02/23/99 ND yg/L 0.3 1 0.3 ' <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Toluene 02/23/99 02/23/99 ND µg/L 0.3 1 0 '1 <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Xylenes,Total 02/23/99 02/23/99 ND µg/L 0.3 1 0.3 <br /> EPA 8020 <br /> (MODIFIED) <br /> f <br /> EPA 8015/ Gasoline 02/23/99 02/23/99 ND pg/L 50 1 50J <br /> EPA 8020 <br /> (MODIFIED) <br /> EPA 8015/ Methyl-cert-Butyl 02/23/99 02/23/99 ND µg/L 5 1 5 <br /> EPA 8020 Ether <br /> (MODIFIED) <br /> I <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> ,ag/L Mi /Liter — ppb DLR Reportable Detection Limit 1 ppb'= 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) f <br /> pg/kg Micrograms/Kilogram — ppb Higher Iimits may result from exceptional sample matrices or interferences <br /> I <br /> l <br /> 14.14 Stanislaus Street • Fresno, CA 93706-1623 • Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />